Automatic fire-alarm.



y 1 2 and Scommu'nicating with said bulb, and

"if 4To'aZZ whom it concern; i

UNlTED STATES refinar espion ALLEN W.l STAFFORD. OE IOLA, KANSAS.

. AUTOMATIC FIRE- ALA RM.

'I Be it known .that I," ALL`EN IV. STArFoRD,

a citizen of the United States, residing at ..-Iola, in the county of Allemand State of Kansas,A have invented certainnew and useful Improvements in'Automatic l? ire- Alarms, of which the following is a specification.

My invention relates to automatic fire alarms, and my object is to produce a simple and reliable device oi this character 'which may be set to sound the alarm at illustrates the invention: Figtire l repre- 'sents a diagram of thealarin ready for op' eration. Fig. Q-is a front elevation partly in'seetion of thethermostat and an adjustablje-`indicator forming important features of the'invention.v

In carrying outthe invention, I employ a thermostat consisting .of a bulb l, tubes an `electrical'conductingfr-tluid Il, consisting 'I preferably of mercury. The bulband tubes consist 'preferably of' glass or other nonconducting material, and the upper end of. `tube 3 is curved for a purpose which will i hereinafter appear.

5 designates a contact leading from a bindingpost 6 intotube 2 and the Huid contained thereby..

7 designates ,an indicator comprising a pointer 8, a scale-9, and a segment 10. Scale 9 and segment 10 have outturned flanges 1l and 12, respectively, against-which the pointer is clamped by a screw 13, upon which said ointer is pivotally-mounted, so

,that when t e screw is loosened, the pointer 'may be adjusted to any degree on the scale 9.

Pointer 8 is provided at its upper portion with a segmental arm 14, which extends into the upper curved portion of tube 8,

, binding-post -16 through a Wire '1911, 01%

1 Specification of Letters Iatent. Patented Jan. .25,- 191,0. Application led February 26, 1909..' Serial No. 480,282. i

by thepr'oper manipulation of pointer 8. 15 designates a' conductor leading from screw 13 to a binding-.post 16.: f

17 designates a board upon which the thermostat, the indicator,- and the bindings,

' posts are mounted.`

18 designates an alarm 'conneetedfto 2O designates a battery,vor other source of electrical energy,connected to the `alarm 1S and the biudingpost 6 by'a WireQl.

In practice the inner .endpof armr 14 is tance from the upper lsurface of the uid feo adjusted the desired-distance from the fluid in tube 3 by properl mani vulatin ointer 8, it being understood that Itghe senitiveness of the thermostat will be greater orless in proportion to the space between the end of arm 14 and the fluid. AWhen" the temperature rises to thev predetermined degree at be expanded through the medium of said rising temperature, submerge the 'adjacent terminal of arm let and 'close'the circuit, so that the alarm will be sounded and remain active until the temperature'- falls below normal, when the circuit will be interru ted and render the alarm inactive by the uid receding and exposing the inner terminal of the arm 14E.

The alarm maybe placed an desired voy..

wvhich the indicator'is set, the ,fluid will i i tance from the thermostat, an a number'of the latter maybe locateddn diierent `portions of the building where fires are liable to originate, and connected to one alarm, which may belocated outside of the build# ing it desired. f

Having thus described my invention, what Y I claim is l. An automatic alarm consistingy of a' thermostat vhaving two Huid-containing tubes, one of said tubes being 'curved at its upper end, a fixed contact having one end submerged in the fluid inthe other tube, a pointer pivotally vmountedv adjacent thether mostat and provided with a. curved arm adapted to be adjusted close to the fluid in the curved tube, a scale against which the pointer is adapted to be locked, and a circuit containing an alarm which isl sounded when the liuid contacts with thecurved arm.

its inner end being aidjusted'the desired dis-l 2. lAn automatic alarm consisting of a Qi l 947,423

thermostat 11a-ving two fud-conzainin Hanges, and a circuit containing an alarm tubes, one of said tubes beimr Curved, a fixe which is sounded when the uldcontacts Contact having onel end su Vmerged in the i Awith the curved :infn` Huid in the other tube, a pointer pivotally In testimony whereof I aixmy signature, muted idjacent ti the themostnt :ml prol in the presence of two witnesses.

Vi e witl a curve arm a :L ted to e ad- T m justed close to the Huid in thle) curved tube, i ALLEB W' Si AFB ORD a. segment having 'an outturned Harige, a Vvmesses: scale havingl an outturned Harige, means 'for L. E. VANATTA,

10 binding the indicator against said outturned J. H. HENDERSON` 

